What Types of Pollen-Producing Trees Cause Allergies

Plants that produce wind-blown pollen, many of which are trees, make life miserable for millions of human allergy sufferers each year. A large number of tree species produce extremely small pollen particles from their male sexual parts. These trees use the wind as their favorite means of pollen transport to others of their own species for pollination. This pollination leads to the procreation of new trees. Thats a good thing. Pollination is critical for trees to reproduce but can be crippling to some people with specific tree allergies and asthma. If these allergy sufferers live in areas with lots of the wrong trees, there can be major health issues and loss in quality of life during peak pollen season. Allergy sufferers can make it through tree pollen season with a minimum of discomfort by following some common sense suggestions. Minimize outdoor activity between 5 and 10 a.m., as morning is the time when pollen counts are usually the highest. Keep the house and car windows closed and use air conditioning to stay cool. But you dont have to stay inside all the time either. You need to have an awareness of the kind of trees you live near or the trees you plant that produces small-sized pollen. Certain trees can become a major allergy problem. It is your understanding of this, in combination with a knowledge of allergy-producing trees, that can help make the difference between an itch and sneeze-free day or a day of complete misery. Pollinating Trees To Avoid There are a number of trees to avoid if you are allergy-prone — and they are not necessarily a single species but usually a single sex. The allergen that triggers your allergy is usually produced by the â€Å"male† part of a tree. Trees vary widely in their capacity to produce and disperse pollen which triggers allergies and asthma. Some tree species that bear separate male and female flowers on the same plant are called monecious. Examples include honey locust, oak, sweetgum, pine, spruce, and birch. You cant do much but deal with these as a species. Dioecious tree species bear male and female flowers on separate plants. Dioecious trees include ash, boxelder, cedar, cottonwood, juniper, mulberry, and yew. If you select a male plant you will have problems. From an allergy perspective, the worst trees you can live around are dioecious males, which will bear only pollen and no fruit or seed. The best plants in your environment are dioecious females as they bear no pollen and are allergen-free. Trees to avoid are male ash, pine, oak, sycamore, elm, male boxelder, alder, birch, male maples, and hickory. Things You Can Do to Avoid a Problem Plan your landscape: Minimize exposure to known allergens by not planting and eliminating certain allergy-causing trees from your property.Plan your time outside: In order to minimize exposure, plan outdoor activities to coincide with times when the pollen count is lowest.Keep up with the pollen count: Follow the local pollen index (the number of grains per cubic meter of air) that will alert you to days when your particular allergens are most prominent.Allergy skin testing: Using the scratch or blood test for allergies can help you determine what type of pollen allergies you have. Pollinating Trees You Can Live With Obviously, the fewer allergenic trees in an individuals immediate vicinity, the less the chance of exposure. Good news is that the great majority of wind-borne pollen grains of all species are deposited quite close to their source. The closer to the tree the pollen stays, the less potential they have to cause allergy. Remember, a pollen-producing tree or shrub next to a home can create ten times more exposure than a tree or shrub one or more houses away. Get those high-risk trees away from your home. One rule of thumb: flowers with large blooms usually produce heavy (large particle) pollen. These trees attract insects that transport pollen and do not depend on wind transportation. These trees are generally lower in their allergy potential. Also, perfect flowers on trees are desired. A perfect flower is one that has both male and female parts in a single flower — not just male and female parts on the same tree. Perfectly flowered trees include crabapple, cherry, dogwood, magnolia, and redbud. Trees that are considered to cause fewer allergy problems are:Female ash, female red maple (especially the Autumn Glory cultivar), yellow poplar, dogwood, magnolia, double-flowered cherry, fir, spruce, and flowering plum.

Slavery During The Civil War - 989 Words

In 1619, America’s first slaves arrived in Jamestown, Virginia to assist English colonists with the production of tobacco. These slaves were brought to the New World by Dutch traders, who ultimately planted the foul seeds of slavery in American soil. Quickly, slavery would spread like weeds throughout the colonies, and became significantly important to the South. According to the Constitutional Rights Foundation, â€Å"Before the Civil War, nearly 4 million black slaves toiled in the American South.† However, during the late 1800s, many American citizens began to contemplate the mortality of slavery, thereby causing the states to divide. Although the North was for the abolition of slavery, the South defended it wholeheartedly. Be that as it may, the white South used economic, political, social, and ideological reasons to defend the peculiar institution of slavery. The white South was based on an agricultural economy, therefore it became one of the main reasons that sla very was fought for and defended. At this point in time, many Southern citizens owned large plantations that needed slaves to work the fields and tend the crops. The Southern states relied on crops like cotton, tobacco, and rice to preserve their economic growth. Adding onto that, in 1793, Eli Whitney invented the cotton gin a machine that revolutionized and revitalized the Southern economy. This machine separated the seeds and fiber from the cotton faster than people could do by hand. Before the invention ofShow MoreRelatedSlavery During The Civil War1159 Words   |  5 PagesThe Civil War, occurring between the years 1861 and 1865, was a devastating effect of sectionalism caused by the division of the country on the topic of slavery. Slavery impacted every aspect of the country, whether in the North or the South, though primarily in the South; major impacts were in the politics and economy of the early country ways which inevitably caused the Civil War. Slavery was the focal point of the economy in the South, this inthrallment was the fuel for the agricultural SouthRead MoreSlavery During The Civil War Essay1728 Words   |  7 Pages Eighteen century was a time period when slavery took deep roots in the New World. Slavery institution deeply affected and shaped the United States in the way we know it now. It affected all aspects of an American society: politically, economically and socially. Slaves were the ones who worked on large plantations, harvesting the crops, taking care of houses, fighting for an American independence, and gave the white people a leisure time to improve their knowledge and exercise political powerRead MoreSlavery During The Civil War1571 Words   |  7 PagesSlavery, defined in Webster’s dictionary as the â€Å"condition in which one human being is owned by another†, was a heinous crime against humanity that was legal and considered a normality in America from 1619 to 1865. In 1865, the Union won the Civil War against the Confederates and declared that African American slaves be emancipated. Before their emancipation, African American families were split up, never to see each other again. Their rights of political and social freedoms were also stripped awayRead MoreSlavery During The Civil War Essay1761 Words   |  8 PagesThe idea of slavery in early America began when African slaves were brought to the newly settled North American settlement called Jamestown in Virginia in 1619, to help in the cultivation of cash crops as tobacco. Slavery was practiced all throughout the colonies in the 17th and 18th centuries, with the abundance of practically free labor provided from the enslaved African-Americans helped pave the road of economic foundations in the newly founded nation. With the invention of the cotton gin in 1793Read MoreSlavery During The Civil War1751 Words   |  8 PagesFreedom. Independence. Liberty. Slavery in America began as early as the 1600’s when the colonists began settling in Jamestown. Originally, slavery was merely a small system of labor, meant to aid the production of crops and help build the economic foundations of the New World. The concept of slavery differed from place to place and from person to person. Some believed that owning another person as a source of free labor was just, wanting to extend the idea of slavery. Others thought the labor systemRead MoreSlavery During The Civil War1900 Words   |  8 Pageslifestyles, abolitionists from north were against slavery and advocated emancipation to slaves in the south. Slavery may not have been the only factor that sparked a disagreement between the north and south but it certainly had an influence on states decisions to remain or leave the Union. The conflict of slavery has been an issue as early as the American Revolution but it became a serious problem around the 1850’s and during the Civil War. The impact slavery had on the Union can be seen in events suchRead MoreSlavery During The Civil War Essay1754 Words   |  8 Pages‘Modern’ slavery in America began in 1619 when the first wave of slaves, were brought from Africa to a North American colony in Jamestown, Virginia. From 1619 to 1807 (when The Act Prohibiting Importation of Slaves was made) according to the Trans-Atlantic Slave Database 12.5 million african were shipped to America. Prior to this slavery had existed as early as 1400 in europe. In America their sole purpose was to facilitate the production of lucrative crops such as Tobacco and cotton. By the 18thRead MoreSlavery During The Civil War1636 Words   |  7 PagesThe Reasons that led to the Continue of Slavery in Virginia When Englishmen arrived at Jamestown they found a great land for farming. A few years later when the Englishmen decided to settle down at the new land, they grew a high-grade tobacco at the Chesapeake . It did not take long time for settlers to understand that they could pay their fines, debts, and taxes with tobacco, so they started to grow tobacco everywhere. In order to support economic growth and luxury living, EnglishmenRead MoreSlavery During The Civil War1908 Words   |  8 PagesThroughout the 1800s in America, slavery was a controversy between the north and the south. A Slave was one who was the property of another human being under law and was forced to obey them. The North felt that slavery was unfair and inhumane, whereas in the South, they felt as though slavery was crucial to their success. African American slaves were not allowed many rights: they were not allowed to testify in court against a white person, could not receive an education, or even sign c ontractsRead MoreSlavery During The Civil War2248 Words   |  9 PagesSlavery of Freedom is Choice Slavery, in which lower class people are treated as property legally but by force, has been a serious issue in human history for thousands of years regardless of culture differences. During the antebellum period, North America abolished slavery of the black, whereas the south violently opposed to abolition no matter how inhuman it is since the south was on foreign trade and slaves provided the labor needed to support the economy. According to different information sources

Mrf Tyre Suggestions Free Essays

string(69) " cotton used to be the only tyre cord material throughout the world\." EXECUTIVE SUMMARY 0. 1 0. 1. We will write a custom essay sample on Mrf Tyre Suggestions or any similar topic only for you Order Now 1 GENERAL Nylon Tyre Cord: Nylon tyre cord is made from high tenacity continuous filament yarn by twisting and plying. There are two major types of nylons used as tyre cord, i. e. nylon-6 and nylon-6,6. The properties of nylon-6 and nylon-6,6 vary marginally and are controlled by the manufacturing process, type of stabilisers and additives used. In India only nylon-6 is produced commercially for tyre cord. Thetypesofnylon-6tyrecordusedinIndiaare840/2,1260/2,1260/3, 1680/ 2 and 1890 / 2 where number indicates denier of ply / no. of plies in the cord. The denier per filament is 6. 0. 1. 2 Tyre Cord: The other materials used as tyre cord are cotton, rayon, polyester, fibre glass, steel,aromatic polyamides. Each of these materials has its own merits and demerits. The major criteria for acceptance of any material in tyre are its tensile strength, dimensional stability, durability, thermal stability, hysteresis and adhesion. Tests and actual application conditions have shown that although other cord materials meet one or more specific requirements, nylon by and large meets the desirable requirements for almost all the performance criteria. . 1. 3 Tyres: The tyre cord fabric provides the tyre its fundamental properties such as shape, size, load carrying capacity, abrasion resistance, fatigue resistance, etc. A tyre is a composite of cord and rubber. There are three varieties of tyres viz. bias-angle tyres, radial tyres and bias-belted tyres. They differ in the way the tyre fabric plies are laid inside the tyre. 0. 1. 4 Manufacturing Pr ocess: The manufacturing process for nylon-6 tyre cord can be broadly divided into following production steps: (a) Polymerisation of caprolactam to manufacture nylon chips. (b) Extraction and drying of chips. (c) Melt spinning of chips to manufacture nylon tyre yarn. (d) Preparation ofcordfrom tyre yarn by twisting and plying. (e) Recycling of nylon-6 waste. 0. 1. 5 Polymerisation: Nylon is made by polymerisation of caprolactam with certain additives like amino acids and dicarboxylic acid salts and certain heat stabiliser such as copper based organic compounds. The polymerisation process involves ring opening polycondensation and polyaddition reactions. All the three polymerisation reaction steps are equilibrium reactions. A typical process of polymerisation of nylon can be either a batch or a continuous process. The continuous process, developed after the batch process was commercialised, offers simplicity of design, ease of operation and control and high capacity. An optimal polymerisation process would involve two stages, wherein, the first stage involves pressure at high initial water concentration. In the second stage a rapid transition from high water content to a low water content is achieved by release of pressure and subsequent application of vacuum. Industrial grade nylon-6 with relative viscosity 3. 2 to 3. has higher degree of polymerisation compared to textile grade nylon-6 with relative viscosity 2. 2 to 2. 6. 0. 1. 6 Extrusion and Drying of Chips: The nylon chips are washed to remove water soluble impurities and then dried. The process maybe batch or continuous. 0. 1. 7 Melt Spinning: The polymer chips are melt in extruder. The molten polymer is then spun through a spinnerette. The molte n filaments are quenched or cooled by a laminar flow of air. The spin finish is applied on filament and then wound on spin bobbins and drawn to make tyre yarns. In the conventional process, the spinning and drawing was done in two steps. In the spin-draw process, a step is reduced compared to 2-step conventional process. As a consequence, some sources of process disturbances are eliminated which results in improved yarn uniformity. 0. 1. 8 Preparation of Cord: Nylon tyre yarns are then twisted in S or Z direction and plied having 2 or 3 plies to form a tyre cord. 0. 1. 9 Recovery of Nylon-6 Waste: Depending on the quality of waste, any of the following method may be used for recycling of nylon waste. Direct use of fibre waste RegrannulationPolymer Powderi) without melting ii) with melting. i) deploymerisationandfilteration i) precipitation from solutions Recovery of caprolactam by deploymerisation. Recovery of amino caproic acid. The first three processes require relatively purer and undegraded form of waste. Amongst the last two, caprolactam recovery is mostly adopted by Indian industry due to ease of purification of recovered caprolactam. 0. 1. 10 Raw Materials, (Catalysts, Additives, Spin Finish Etc. ): For nylon- 6, the only major raw material required is caprolactam. Water is required as an initiator for ring opening during polymerisation. Nitrogen gas is required for blanketing, drying and conveying of polymer. 0. 1. 1 Additives/Catalysts: Aminoacids and diamine dicarboxylic add salts which provide water on condensation have been found to be useful for enhancing the rate of polymerisation. 0. 1. 12 Stabilisers: Nylon is susceptible to degradation by Lght, heat, oxygen etc. To make it suitable for the purpose of tyre cord, stabilisers are added. The light stabilisers used are manganous chloride + hypophosphorous add and imidazoles. Diphenylamine and acetone condensates give excellent resistance to heat. Copper complexes as halides, acetate, phosphates, salts of higher fatty adds like stearates, palmitates, laurates, etc. re quite effective as heat and light stabilisers. Spin Finish: The functions of spin finishes are to reduce friction to get proper filament cohesion and to provide static p rotection. Lubricants used to reduce friction are usually mineral oils, fatty glycerides. The antistats used to provide static protection are surface active organic compounds. In case of nylon tyre cord, where molten polymer is drawn in yarn stages and fabric is dipped at a very high temperatures (upto 210Â ° C), preference has been towards the use of non-fuming type spin finishes. 0. . 14 Major Capital Equipments: The major capital equipments for each section of the plant viz polymerisation, spinning, cord making and caprolactam recovery are listed in para 1. 7. 0. 1. 15 Development of Technology: The developments in technology canbe grouped into the following: Product development. Development in the polymerisation process. Development in extraction and drying. Development in melt spinning process. A. Product Development: Till 1937, cotton used to be the only tyre cord material throughout the world. You read "Mrf Tyre Suggestions" in category "Essay examples" Thereafter rayon beca me popular. Subsequently with the advent of synthetic fibres, the use of nylon increased, which continues to be used in both the developed and developing countries, Other materials used are polyester introduced in 1962, fibre glassin 1967 and steelin 1970. NTC was earlier spun as 210 d-yarn and then plied to give 840 d tyre cord. With the development of technology, now, directly 840 d yarn can be spun and then plied to get denier ranges of 1260, 1680 and 1890 tyre cord. The denier per filament has however remained^ fe though some attempts have been made to use 8 deniers filaments also. It has been possible to increase tenacity from 8 gpd to9. gpd. B. Developments in Polymerisation Process: In early process, a relatively crude batch autoclave reactor was used for polymerisation. The V K tube reactors for continuous polymerisation, were introduced during early 50s. Initially, V K tube reactor had capacities of 1. 5 TPD which has now been increased upto 40 TPD. Over a period of time, number of stag es of polymerisation has also increased from one to seven. Continuous developments have also taken place for modifying the design of reactors to achieve plug flow condition and uniform flow and temperature gradient, improve residence time, conversion rate and quality of products. The details of some such developments are discussed in para 1. 8. C. Developments in Extraction and Drying: In this area also, batch type extraction and drying process have been replaced by continuous processes. Chips are now stored in S. S. tanks and conveyed pneumatically to spinning section. D. Developments in Spinning Process Melting of chips was done by oil heated grids in the pre-world war era, then by electrically heated grids. In the late fifties a short barrel screw extruder was introduced which is now replaced by longbarrel extruder. Another development is increase in the spinning capacity by increased number of spinning positions and also increased number of ends per spinning position. Other improvements are in yarn solidification and quenching process, spin finish application methods etc. During late seventies, the spin-drawn process was introduced to get higher productivity and better product. During the same period, high speed spinning with take up speed of 3,000 to 4,000 mtrs/min (as compared to upto 1500 mtrs/ min in case of conventional process) was developed. 0. 2 . 2. 1 STRUCTURE OF INDUSTRY AND STATE OF THE ART: Structure of Industry: Licensed and Installed Capacity The total licensed and installed capacity of NTC in India at present is around 29,500 TPA and 22,500 TPA respectively, as per the details given in para 2. 1. 10. LOI / IL have been issued which cover capacity of 54,200 TPA. Production: The production of NTC in India started in 1971 with 595 tonnes and increased to around 23,600 tonnes in 198 5. NTC has replaced rayon tyre yarn as tyre cord yarn and market share of NTC at present is 75%. Capacity Utilisation: The licensed and installed capacity is based on certain denier while production is of different deniers and the product-mix of all manufacturers varies depending on market requirements. However, the overall average capacity utilisation ofNTCinIndiahasbeenaorundl05%duringthelastfiveyears. Distribution of Units: Active NTC manufacturers are public limited companies spread almost all over India with average capacity of 4000 TP A. Performance of Industry: The production, sales, net fixed assets, net worth of all the NTC manufacturers show an upward trend. There is a general growth rate of 20% per annum on sales turnover during last five years. Import/Export: Import of NTC increased from 1677 tonnes in 1980-81 to 5295 tonnes in 198384 The price of NTC at international level is just half of the price in India. This is mainly due to high cost of raw materials, higher conversion costs due to old technologies and small size of Indian plants as compared to the plants in developed countries. Due to this, export of tyre yarn from India is negligible. Sources of Technology and their Broad Performance: Unitika, Japan has supplied technology and plant to three out of five Indian manufacturers of NTC. The other two manufacturers started with imported plants. The details of these collaborations are given in para 2. 15. 2. Performance of all the collaborations is satisfactory. Though, indigenous technology comprising of batch polymerisation and conventional spinning process have been developed, none of the NTC plants in India has yet started with such indigenous technology. The latest technologies comprising of multi-stage continuous polymerisation, continuous extraction and drying of chips, spin draw technology or high speed spinning process are not yet available indigenously. The recent trend in India to look to the ‘east’ for technology may be due to the availability of technology comparable to those available from the west at a lower know how fees and lower plant costs. 2. 2 Technological Status of Indian Industry (Unit wise): The comparison of installed capacities, actual production and capacity utilisation and financial analysis in terms of net sales, net fixed assets, net profit and net worth over the period of last five years and present specific raw materials and utilities consumptions, wastage generation and recovery etc. for the following selected units is given in para 2. . J. K. Synthetics Ltd. National Rayon Corpn. Ltd. Shri Ram Fibres Ltd. Nirlon Synthetics Fibres Chemicals Ltd. Baroda Rayon Corporation Ltd. Details of the historical background, sources of technology, research and development efforts, results achieved, etc. for each of the above units are summarised hereunder. a) J. K. Synthetics Ltd: J. K. Synthetics Limited, p ioneer in the manufacture of NTC, have absorbed to a great extent the conventional technology over the last 2 decades. The company has its own research insitute—The Sir Padampat Research Centre (SPRC) and has recently floated a company—Jaykay Tech. hich can supply the conventional technology. As far as horizontal transfer is concerned, conventional technology developed and absorbed by J. K. has little commercial relevance. J. K. ‘s licenced and installed capacities are 6000 to 5000 TPA respectively. The company has recently entered into technical collaboration with M/s Tong Yang of south Korea for their latest Spin-Draw technology. The new unitwithacapacityofl2. 5TPDiscomingup. b) The National Rayon Corporation Ltd. (National Rayon): National Rayon commenced production of rayon tyre cord in 1961 and nylon tyre cord in 1976. The company has a technical collaboration for the latter with Unitika, who have supplied the technology and plant. The company had installed indigenously developed equipment for conversion of polymer waste to granules of spinnable grade. They have successfully indigenised manufacturing of all additives through in-house research as well as developing other suppliers. National Rayon’s licensed and installed capacities are 5,000 and 5,250 TPA respectively. The company’s performance during 1983 and 1984 had been adverse due to closure of plant because of labour problems. The production during 1985 to 1988 is more than the licensed capacity. As a part of modernisation and expansion programme they have installed spin-draw machines. The spin-draw yarn produced and made into fabric has alreadybeenapprovedbythecustomers. National Rayon have a fullfledged R centre approved by the Government of India and is engaged in import substitution, technology absorption, machinery development and trouble shooting. National Rayon have developed process technology for polypropylene industrial yarn of high tenacity and has been regularly supplying polypropylene yarn for market development. It has also developed rayon industrial yarn, an industrial fabric for non tyre applications. National Rayon have recently installed, for the first time in India, air jet looms for making tyre fabrics of high quality. c) Shri Ram Fibres Limited (SRF): SRF’ s plant for manufacture of nylon tyre cord and yarn was commissioned in 1974 in technical collaboration with Unitika. Company’s present capacity is 6,335 TPA. SRF has a full-fledged Research and Development Laboratory and is constantly updating process methods and technology for product development. SRF have an independent research institute too. A very recent process developed and patented is that for polymerisation of nylon-6,6. d) Nirlon Synthetic Fibres Chemicals Ltd. (Nirlon) Nirlon commenced production of nylon filament yarn and tyre cord in 1962. The company had recently gone into technical collaboration with Zimmer for an expansion of their nylon tyre cord plant. Their present capacity is 5,000 TPA. Zimmer’s design is based on multi polycondensation process and single stage spin draw process. Nirlon has a well established research and development base. The company had absorbed the conventional technology for manufacture of nylon tyre cord and is concentrating in developing and acquiring more modern manufacturing process. e) The Baroda Rayon Corporation Ltd. (Baroda Rayon) Baroda Rayon commenced production of rayon in 1962. Subsequently, the company commenced production of nylon tyre cord in 1981 in technical 8 collaboration with Unitika. Their present installed capacity is 2,000 TPA. Expansion of their plant to 4,000 TPA is under implementation and is expected to be commissionedby end 1987. f) The following new units likely to come up in the near future. The present status / each of these projects is given in detail in para 2. 1. GarwareNylons Limited: Presently the company manufactures nylon and polyester filament yarn and is expanding its activities to manufacture nylon tyre cord, nylon tyre and industrial fabric in collaboration with Allied Corporation, U. S. A. , the largest producer of tyre cord in the world. Century Enka Limited: The company’s major activity is manufacture of nylon and other man made fibres and plastics. Century Enka has a collaboration with their principals Enka International of Holland for the technology for manufacture of nylon 6 tyre cord. The production has commenced recently. Ballarpur Industries Ltd. andE. I. Du Pont Nemours Co. of U. S. A. : They have jointly proposed to promote a Rs. 130 crores joint venture company to produce nylon-6,6 tyre cord for the first time in the country in collaboration with economic development corporation of Goa. An annual production of 16,700 tonnes of nylon-6,6 tyre yarn is envisaged. Kanoria Alkalies Plastics Ltd: They have entered into collaboration for technical know-how, plant and machinery for manufacture of nylon tyre cord with Unitika which has been approved by Government of India. 0. 2. Status of Raw Material Industry: At present only Gujarat State Fertiliser Corpn. Ltd. , Baroda manufacture caprolactam with the capacity of 20,000 TPA in India. Three LOI have been issued by the government with a total capacity of 2,20,000 TPA. The demand projections for caprolactam made by the Committee for Perspective Planning of Petrochemical Industry by 2000 AD are 1,16,000,1,96,000 and 3,02,000 TPA for year 1989-90,1994-95 and 1999-2000 respectively. Hence, till the units who have LOI go into production, imports of caprolactam is unavoidable. The quality of indigenous caprolactam in terms of its permanganate no. nd also in terms of consistancy between various batches of manufacture is not comparable to that of imported caprolactam. 0. 2. 4 Status of Tyre Industry International: There are three types of tyre construction viz. , bias, bias-belted and radial. Radial and bias belted construction are more efficient than simple bias construction. In the world tyre market, radial tyres dominate. They were first inroduced in passenger cars then in commercial vehicles, buses and truck respectively. In U. S. A. market, no rapid change over from bias to radial tyres took place because of the tremendous capital investment required. Instead, belted bias tyres which could be manufactured on existing equipments were developed. The current trends in tyre design and manufacturing include: Use of fewer fabric plies in tyres by utilising larger and stronger cords. Use of special treatments in yarn manufacturing of the cord processing to reduce the creep of cords in tyre. Use of newer fibres such as polyester and modified nylons etc. 0. 2. 5 Status of Tyre Industry -Indian: The installed capacity of Indian tyre industry is 12 million nos. per annum, the estimated demands of tyres by 1989-90 and 1994-95 are around 21 and 31 million nos. espectively, as per estimates of Automobile Tyre Manufacturers’ Assocation (ATM A). Preference so far has been towards bias angle, because of the practice of overloading; practically no care of tyres by owners / drivers and poor road conditions. However, some radial passenger car tyres have also been introduced in the market. Due to the higher melting point of nylon-6,6 and polyes ter as compared to that of nylon-6, the tyre curing temperature can be increased to 250Â ° C from 210Â ° C (for nylon-6). This would make curing of tyres faster and hence reduce curing cycle. This would result in higher output and also higher productivity. In practice, howevr, fast curing is not realisable in case of heavy duty tyres as the thicklayer of tread rubber will get distortedby fast curing. To take advantage of this higher productivity, the tyre manufacturers will have to install higher capacity curing furnaces, which will require substantial investment. Hence, before tyre manufacturers decide to install such furnaces, they would like to confirm regular availability of nylon-6,6 tyre cords at reasonable prices preferably from more than one supplier. 10 The switch over from nylon-6 to nylon-6,6 would also result in more down time in tyre manufacturing. Similarly switch over from nylon to polyester requires change in dip condition, double dip processing and more downtime. Hence, whatever nylon they use, they will use it for 100 % of their requirements. 0. 2. 6 Tyre Cord and its Suitability for Various Types of Tyres: Different types of tyres require tyre cords with different properties, indicated in para 2. 12. Radial tyre or belted tyre designs take adavantage of these different requirements by placing different types of cords in the belt and in the carcass. As per the test carried out by one of the Indian radial tyre manufacturers, nylon-rayon was found to be the best combination for Indian conditions. 0. 2. 7 Status of Tyre Cord Industry -International: Major varieties of cords suitable for tyres are cotton, rayon, nylon, polyester, steel, glass fibres and aromatic polyamides. Although flat spotting shown by nylon was originally objected to strongly, nylon has continued to be the preferred tyre cord material because of its price and its superior thermal and fatigue resistance. Nylon-6 is used in Europe and other developing countries while nylon-6,6 is more prominent in U. S. A. mainly due to the manufacturing facilities established and availability of basic raw material. During the last ten to twelve years development have been largely of evolutionary nature aiming to overcome limitations of existing tyre fibres and to make them acceptable for wideruse. 0. 2. 8 Status of Tyre Cord Industry in India: Tenacity of NTC available to Indian tyre manufacturers locally varies from 8. 4 to 9. 4 with average value of 9. 2 gpd. The present demand of NTC in India is around 25,000 TPA which is likely to grow to 40,000,50,000 and 61,000 TPA by 1990,1995 and 2000 AD respectively. At least for next 10-15 years, even in case of radial tyres, nylon would continue to remain as one of the components either in carcass or as belt material. With the existing manufacturing facilities, the type of vehicles in use and existing road conditions, nylon-6 will remain the material of choice except for a small quantity of radial tyres for passenger vehicles where polyester may prove to be superior. At present very little nylon-6,6 is used in India, both for textiles and industrial applications. Besides nylon-6,6 is not produced indigenously. Nylon-6,6 is costlier than nylon-6 worldwide and is likely to be more so in India. Nylon-6,6 is unlikely to be used by tyre companies for their bus and truck tyres 11 (weightage 80%) in near future, mainly due to generation of high shoulder temperature. In view of the above, establishment of fresh production capacities for nylon-6,6 industrial yarn in India may not have much scope considring interest of industry as well as the end-users. . 2. 9 State ofthe Art Scene (International) Twenty five leading manufacturers of NTC in the world are listed in para 2. 15. 1. SalientFeatures of Contemporary Technologies: The technology for manufacture of NTC is standardised as far as polymerisation process is concerned. Product characteristics of different technologies may vary marginally depending upon the type of additives and stabilisers used, design of equipment and control method of production parameters. However, design of spinning plants differs from supplier to supplier. Salient features of contemporary technologies of the following technology suppliers who have supplied/offered technologies to India are discussed in detail in para 2. 15. 2. Zimmer A . G. , West Germany. Lurgi GMBH, West Germany. Unitika Ltd. , Japan. E. I. DuPontDeNemoursCo. ,U. S. A. SniaBPD, Italy. Some important features of these technology suppliers are described in subsequent paragraphs: Zimmer A. G. : Zimmer offers production of nylon-6 in continuous polymerisation operation. The specific Zimmer design allows lower water/chip ratio resulting in a high extract content in washing water, thus saving energy to caprolactam recovery plant. The company offers economic standard design for production capacities of 10 to 50 TPD for high viscosity polymer (tyre cord grade). For caprolactam recovery, Zimmer prefers batch operation for higher flexibility regarding quality and capacity. The plant is specifically designed for low caprolactam concentration in waste water, so that it can be either reused in polymerisation plant, or discharged as innocuous waste. 12 For spinning and drawing, Zimmer offers both, the two step separate process and the one step spin draw process. The former process favours production of: i) lower deniers economically i) low shrinkage yarns iii) large variety of yarn types. The one step spin draw process favours continuous production of heavier denier yarns in large capacities. It results in improvedyarn uniformity. .Lurgi GmbH: Lurgi offers both continuous polycondensation and batch polycondensation route for nylon-6 for use in tyre cord and other technical/ industrial yarn. Lurgi also offers caprolac tam recovery unit deploymerisation and condensation plant and equipment for evaporation of the extracted water, treatment of concentrated caprolactam water and distillation. The company offers technology for conventional speed spinning as well as high speed spin draw process. Untika Ltd. , Japan: Unitika offers continuous polymerisation process having a pre-polymeriser coupled with continuous extraction, washing and drying of chips. It also offers caprolactam recovery process. In its polymerisation process, Unitika claims 50% saving in polymerisation time. Viscosity of melt can be adjusted as per requirement during pre-polymerisation. The spinning process offered is both conventional spinning and drawing as well as spin draw process. E. I. Du Pont de Nemours Co. U. S. A. : Du Pont’s industrial yarn process is based on nylon-6,6 salt i. e. hexamethylene diammonium adipate. The company has practised the continuous polymerisation technology and has developed conditions which maximise conversion, maintain precise viscosity control and ensure extended service life. Nylon-6,6 is produced continuously in a series of five vessels – evaporator, rea ctor, flasher, separator and finisher. Streamlined design of polymer vessels and distribution system minimises gel formation, recapture of heat and diamine and hence reduces cost of operating system. 3 Preferred Du Pont technology is based on coupling the spinning machine directly to the continuous polymeriser. It also utilises coupled spindraw. The advantages are elimination of chip making, handling, drying and remelting as also provision of maximum polymer uniformity. Du Pont offers extensively developd quality control and laboratory testing procedures and a single, specially formulated fibre finish for all products. SNIABPD: SNIA is an Italian company giving process knowhow, plants and equipments for manufacture of nylon filament yarn and tyre cord. The company has the spin draw technology. 0. 2. 10 Latest Developments in Manufacturig Process/Design of Equipment: Product Development: Recent developments have been in the areas of improved dimensional stability of the cord, higher tenacity of tyre cords and improved heat stabiliser formulations to reduce the mechanical loss due to heat generation in tyres. Improvements in Polymerisation Process: Recent developments in this area include attainment of higher molecular weight by vacuum finishing, solid phase poymerisation to get final polymer free of extractables etc. addition of chain – coupling agents. Other significantadvances includes: For removal of unconverted monomer For lower level of water extractables in nylon polymer For improved flow and temperature distribution For transferring heat to the centre of the reactor and also to equalise flow rates Improvements in Spinning Process: The developments are directed to achieve higher spinning output upto 97% and to spin NTC of high molecular weight and melt viscosity to have high tenacity tyre cord upto 10 gpd. 0. 2. 1 Critical Evaluation of Contemporary Technology: During initial stage the technology of the synthetic fibre remained with only a 14 Falling film / spray reactors, reactorsworkingundervacuum. Organic polymer coating, internally, ofVK tube reactors. Incorporation of a tubular heat exchangerinthereactor. Provision of perforated plates and vertical aluminium partitions. few giants in the category of front line producers. Because of their conservative attitudes, no rapid technology changes were forth coming. However, the role played by the independent engineering companies which took the risks has been a great boon in the development of technology. Technology suppliers can be broadly classified as front line suppliers having production back up like Unitika, Du Pont etc. and engineering companies like Zimmer, Lurgi, etc. Technology from front line producers is superior technology, requiring less time and wastage generation during production stabilisation at plant commissioning stage. However, know-how fees of these suppliers is higher compared to that of engineering companies. Engineering companies have vast experience in plant erection, basic and detailed engineering. Know-how fees of these companies are comparatively lower. The present trend is to look to the East for technology compatible with that of western countries as it is more economical, although of late, they too are becoming expensive. A project profile based on the typical offer of contemporary technology for a 6,000 TPA NTC project is placed at Annexure I. Instead of putting up many small size plants, it would be advisable to put up a few large size plants for economy of scale. The improvement in quality of polymer is a developmental activity which is continuous at international level. Indian companies should also endeavour to improve quality by adopting new engineering and equipment development either through their own R department or through their technical collaborations. New and better type of additives and catalysts development at international level should be incorporated by the Indian companies. Spinning plants having higher spinning efficiency and compactness, are always advisable for a country like India,to reduce the cost of production. One step process of very high spinning speed to make full drawn yarn may not be relevant in India, as at present most of the weaving and cord preparatory processes are of conventional type. So the ideal thing would be to change over to readily available higher throughput equipment. 0. 3 0. 3. 1. TECHNOLOGY ABSORPTION AND GAPS: R Efforts in National Laboratories/Institutions and Their Tie Up With Industry: Institutions like IIT, S ASMIRA, MANTRA etc. , private research institutions like 15 Sir Padampat research Centre, Shri Ram Institute of Industrial Reserach etc. nd in-house R centres of manufacturing industry are engaged in minor research projects for optimisation of production parameters or improvement of product characteristics. Developing countries like India although gradually laying more emphasis on its research and development, have not been able to catch up with their developed or advanced counterparts i. e. there is a considerable time lag between adoption of any particular process in some advanced part of the world and its commissioning in India. The efforts made to bridge this gap in the following areas are as folio ws: Indigensation of capital equipments, spares etc. Indigenisation of raw materials. Modifications and improvements in process, plant and equipments. The major constraint faced by manufacturers of indigenous equipments and spares are: non-availability of design and detailed engineering drawings. patented designs of proprietary equipments by technology suppliers, sources of capital equipments recommended by technology suppliers, limited indigenous demand of such equipments. 0. 3. 2 Indian Standards Specification: As a part of standardisation, the Bureau of Indian Standards has developed IS Specifications for methods of tests for tyre yarns as per the following details. IS:4910 Parti Part II Partlll Part IV Part V PartVI Tyre yarns, cords and tyre cord fabrics made from man made fibres, methods of tests for. Linear density. Breaking load, elongation at break and tenacity. Dippickup Heat shrinkage and heat shrinkage force. Wet contraction and wet contractive force. Definitionofterms. 16 Part VII Part VIII Part IX PartX Part XI Heat degradation. Thickness (gauge) Sampling Growth Commercial weight. The specifications of polyamide tyre cord warp-sheet for automotive tyres published by the bureau is, IS 11926:1987. The specifications are given in Table 4. . 3. 3 Profitability of Indian Industry and its Relationships with Technology: At present the profit margins of NTC manufacturers are fairly satisfactory, even with the present conventional technologies and small capacity plants. Interaction with user industry by NTC manufacturers is also quite good. However, the constraints in respect of technology absorption faced by Indian NTC industry are: low capac ities of plant. imported capital equipments, parts and spares, non-availability of trained technological manpower, poor labour – management relations. . 3. 4 Export Performance Due to high cost of raw materials and also higher conversion costs due to small capacity plants based on older technologies, the Indian NTC industry has not been able to contribute in the export market. 0. 3. 5 Comparison of Product Specification Between Units: In India, the product range and specifications of all the manuacturing units is almost identical. 0. 3. 6 Modernisation Need: As mentioned earlier, cost of production of Indian NTC industry is higher due to small capacity plants based on older technologies. There is an urgent need to modernise these plants to adopt most advanced technologies and a much higher level of operations. 17 However, for such modernisation substantial funds willlbe required. Financial Institutions are giving soft loans under technology development funds and industries have started taking advantage of this scheme. 0. 3. 7 Technology Gap: Technology gaps in following areas have been identified and discussed in para 3. 9 Product developments Plant capacity Polymerisation process Melt spining process Indigenous manufacture of plant and equipments Indigenous availability of raw materials, additives and spin finishes etc. Internationally, cords with yams having 8 deniers per filament and upto 3,000 deniers of cords and 11 gpd tenacity are available, while in India cords with yarns having only 6 deniers per filament and 9. 2 gpd tenacity are manufactured. The average plant capacity of NTC in India, till 1983, was 2,000 TP A against the defined economic size of plant of 6,000 TP A. Polymerisation: Since the modern continuous polymerisation, extraction, washing and drying systems are suited to large capacity, till recently only conventional batch processes were used. Further, continuous polymerisation lines eliminating chip formation (especially in nylon-6,6) and remelting are not in use at preesent, in India. Melt spinning: More efficient large capacity spinning equipments are being used in the world. These have sophisticated yarn sensing and monitoring systems and hence the quality of yarn is much better with higher throughput. Such latest spinning processes are not available in the country and such technology is now being imported. 18 Reasons for technological gaps are: seller’s market situation large number of small capacity plants. otalabsence of exportmarket. good financial performance of Indian Industry even with the available technologies. general / absence of RD efforts and know-why exercises, limited developments in the Indian automobile industry, lackof product upgradation at tyre manufacturer’s end. To bridge the technological gaps, import of latest spinning equipments and process know-how for spin draw and high speed sp inning process, designs and drawings for modernisation of existing polymerisation processes are required. 0. 4. 0 SUGGESTED: STEPS TO BRIDGE TECHNOGICAL GAP The following suggestions are made to bridge the technological gap: a) Latest technology comprising of continuous polymerisation in two stage V K Tube reactors, continuous extraction and drying of chips, spin draw technology or high speed spinning processes for fully oriented yarn may be imported and horizontally transferred in India. Although some pilot units have been installed by spinners, the industry seems to be waiting for customers’ acceptance. b) Develop indigenous manufacture of selected equipments, wherever it is economically viable and import only latest plant and equipments on selective basis. ) Develop basic and detailed engineering expertise in Indian engineering companies to necessitate import of only design and drawings for new plants rather than package import. An engineering organisation having expertise in basic and detailed engineering should be encouraged for development and transfer of technology for NTC and related products. d) Widen RD efforts both at i ndustry and research institutions level with active association and close cooperation between them. e) Provide necessary incentives to indigenous development of manufacture of plant and equipment. 9 f) Permit only large sized plants. g) Provide incentives for intensified research activities at industry level with close monitoring of such incentives. Establish a central tyre research institute with facilities to test developments in new designs of tyres, new tyre cord materials and modifications in tyre cord materials. Develop skills in technical personal, by arranging training abroad or by arranging traimng programmes by institutions like IIT, S ASMIR A, etc. and constant interaction with foreign experts. 20 How to cite Mrf Tyre Suggestions, Essay examples

Japanese Internment Wwii Essay free essay sample

As they were forced out of their own homes, uprooted from the land that they had contributed so dearly into making their own, the Japanese found themselves as victims of their own state—Red-flagged for espionage and sabotage in the North American states of Canada and the United States of America (US). These neighboring countries handled the same situation rather differently, and despite the many similarities between Japanese internment in the US and Canada during the World War II (WWII) era, there were many differences as well. The Japanese, in both cases, were discriminated against (prior to WWII), suffered property and financial losses, labored in various occupations, and were awarded reparations. Distinctions can be seen between internment of the Japanese in the US and Canada, in dealing with Japanese property and the cost to stay at these camps, the general attitude towards the Japanese, and the outcome of the Japanese in these respective countries. These internment camps for Japanese Americans and Canadians show racism and discrimination, as most, if not all, of these Japanese were loyal to their country. Initially, there was already discrimination and racism occurring in both Canada and the US preceding the outbreak of war, compelling these nations to react with the execution of relocation and internment of Japanese citizens and aliens. In Canada, the war measures act of 1914 required enemy aliens to register for IDs, of which they must constantly possess. This act also revoked general freedoms for those of Japanese lineage, including their right to bear arms, to read or write in languages other than French and English, to freely leave the country, and to join various movements. While many Asians were migrating to the Western US at the turn of the twentieth century, they faced bigotry in the work environment, forcing many of them to found their own businesses. It didn’t stop there though. The Oriental Exclusion Proclamation of 1907 placed restrictions on Japanese migration and in 1924, citizenship was denied to those that had entered and further immigration was prohibited. As Franklin Delano Roosevelt (FDR) signed Executive Order 9066 (February 19th, 1942), following the Japanese attack on Pearl Harbor (December 7th, 1941), both the US and Canada began to react similarly—by relocating â€Å"enemy aliens† to various internment camps. With the displacement of the Japanese came issues regarding the property that they left behind. Many had no choice but to leave behind homes, businesses, ersonal belongings, and other assets. In 1943, the Canadian â€Å"Custodian of Aliens† seized and auctioned off Japanese property quickly and cheaply , while in the US a majority of property loss was due to evacuation on such short notice and failure to find trusted people to oversee Japanese property (ww2pacific. com), forcing them to either sell it for a fraction of its true value or abandon it and hope it was still there upon their return—it often wasn’t. In these camps, in both Canada and the US, conditions were unfavorable, but not nearly as bad as conditions in Europe. The Japanese labored, farming sugar beets in Canada, and in the US camps they would often farm and perform industrial jobs, while children went to school. In relation to Japanese internment, both the US and the Canadian government offered reparations for those who were affected by the displacement. Upon release, the US gave each of the internees $25 and a train ticket back home. In 1968, the US began redress for property loss, and in 1981 congress awarded $20,000 to the surviving 60,000 ex-internees. In Canada redress of $21,000 was given to the surviving internees. This was a small step in the right direction for these governments who recognized their wrongdoings at a later point in time. In contrast, about 120,000 Japanese were relocated in the US, 66% of them being US citizens (Nisei) and 33% being Japanese-born non-citizens (Issei), compared to some 22,000 people of Japanese descent in Canada. Varying attitudes of the two nations caused different outcomes for the Japanese as they experienced varying treatments. In December of 1944 the Supreme Court ruled that this internment was unjust, and on January 2nd, 1945, Executive Order 9066 was repealed, allowing the internees to return to their lives if they wished, while in Canada, following the war, it was still evident that the Canadians did not want these Japanese in British Columbia at all. Ian Mackenzie portrays this attitude as he says, â€Å"It is the government’s plan to get these people out of B. C. as fast as possible†¦ Let our slogan be for British Columbia: ‘No Japs from the Rockies to the seas. † The attitude was unwelcoming towards the Japanese in Canada to say the least. They sought to deport them back to Japan and relocate them to the other side of the Rocky Mountains. This reinforces the excessive hostility that the Japanese faced at the hands of the Canadians. The Canadian government was unconcerned with the effects of its actions on the Japanese, as they charged the Japanese for their stays at these camps. They received these funds by selling the Japanese possessions, a disgrace that the Japanese did not face in the US. The Canadians were so anti-Japanese that they wouldn’t even let them serve in the military to show their loyalty to the state (u-s-history. om). In America however, those who proved their loyalty to the state could actually leave the camps if there was no doubt, and they could enlist. The internment of the Japanese was an embarrassment to both Canada and the US, to say the least. This unethical plan, to this day, has an unknown result, as nobody knows what may have occurred had the internment never happened. Nevertheless, these countries both relocated the Japanese as a result of discrimination, causing loss of property, labor, and ultimately, redress. Canada was much more harsh than the US in their attitudes and actions, as they actually charged for imprisonment. Either way, the internment was devastating for most Japanese Americans and Japanese Canadians as they were forced to seemingly start their lives over afterwards.